The consumption of caustic soda is mainly caused by formation of sodium hydrate aluminosilicate and it can be calculated from the ratio of N/S of red mud.
拜耳法生产氧化铝的过程中，碱耗的主要原因是因为有钠硅渣的生成，碱耗可以用赤泥钠硅比（N/S）表征。
2
Some kassite is found in the red mud, and its crystal parameters are determined. The chemical cause for the reduction of caustic soda losses is also analysized.